Water-soluble azo compound or salt thereof, ink composition and colored product

Abstract

The present invention relates to a water-soluble azo compound or a salt thereof represented by the following formula (1): (wherein, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a sulfo group, n, m, x and y represent an integer of 1 or 2, 1 to 3, 2 to 4 and 1 to 3, respectively.) and an ink composition containing the same; the above compound or a salt thereof has a hue possessing a high vividness suitable for inkjet recording, provides various fastnesses to recorded matters, and is useful as a yellow coloring matter excellent in storage stability when prepared into an ink composition, and suitable for ink compositions, especially inks for inkjet recording.

1. A water-soluble azo compound represented by the following formula (1): 
       
         
           
           
               
               
           
         
       
       (wherein, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a sulfo group, n represents an integer number of 1 or 2, m represents an integer number of 1 to 3, x represents an integer number of 2 to 4 and y represents an integer number of 1 to 3, respectively) or a salt thereof. 
     
     
       2. The water-soluble azo compound or the salt thereof according to  claim 1 , which is represented by the following formula (2): 
       
         
           
           
               
               
           
         
       
       (wherein, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a sulfo group, n represents an integer number of 1 or 2, l represents an integer number of 1 or 2, x represents an integer number of 2 to 4 and y represents an integer number of 1 to 3, respectively). 
     
     
       3. The water-soluble azo compound or the salt thereof according to  claim 2 , wherein in the formula (2), R is a hydrogen atom, a methyl group, a methoxy group or a sulfo group, l is 1 or 2, n is 1, x is 3 and y is 2. 
     
     
       4. The water-soluble azo compound or the salt thereof according to  claim 2 , which is represented by the following formula (3): 
       
         
           
           
               
               
           
         
       
       (wherein, OMe represents a methoxy group). 
     
     
       5. An ink composition containing the water-soluble azo compound or the salt thereof according to any one of  claims 1  to  4 . 
     
     
       6. The ink composition according to  claim 5 , which contains a water-soluble organic solvent. 
     
     
       7. The ink composition according to  claim 5  or  6 , which is for inkjet recording. 
     
     
       8. An inkjet recording method comprising discharging ink droplets of an ink composition according to  claim 7  in response to recording signals to conduct recording on a record-receiving material. 
     
     
       9. The inkjet recording method according to  claim 8 , wherein the record-receiving material is a communication sheet. 
     
     
       10. The inkjet recording method according to  claim 9 , wherein the communication sheet is a sheet having an ink receiving layer containing a porous white inorganic substance. 
     
     
       11. A colored product colored with the water-soluble azo compound according to any one of  claims 1  to  4  or the ink composition comprising said water-soluble azo compound. 
     
     
       12. The colored product according to  claim 11 , wherein coloring is performed by an inkjet printer. 
     
     
       13. An inkjet printer wherein a container containing the ink composition according to  claim 7  is installed. 
     
     
       14. The water-soluble azo compound or the salt thereof according to  claim 1 , wherein in  claim 1 , the phenyl group having a condensed ring shown by a dotted line which is substituted by (SO 3 H)m is a 2-naphthyl group.